CONSOLIDATED STATEMENT OF UNITHOLDERS' CAPITAL - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common Units, Outstanding (in units)		331,974,913			331,974,913
Balance Beginning		$ 4,543,605		$ 5,891,427	$ 4,543,605	$ 5,891,427	$ 4,427,180
Sale of units, net of offering costs of $8,762					224,665
Issuance of units					0	13,354	2,783,907
Cancellation of units					0
Purchase of units					(672)
Distributions to unitholders					(323,878)	(962,048)	(682,241)
Unit-based compensation expenses					56,136	53,284	42,703
Reclassification of distributions paid on forfeited restricted units					865	602	176
Excess tax benefit from unit-based compensation and other						347	160
Excess tax benefit from unit-based compensation and other					(9,811)
Deferred tax on capital contribution						(1,552)	(10,879)
Net loss	$ (2,472,207)	$ (339,160)	$ (154,502)	$ (85,337)	(4,759,811)	(451,809)	(691,337)
Balance Ending	$ (268,901)		$ 4,543,605		$ (268,901)	$ 4,543,605	$ 5,891,427
Common Units, Outstanding (in units)	355,017,428		331,974,913		355,017,428	331,974,913
Units
Common Units, Outstanding (in units)		331,975,000		329,661,000	331,975,000	329,661,000	234,513,000
Sale of units, net of offering costs (in units)					19,622,000
Issuance of units (in units)					3,611,000	2,314,000	95,148,000
Cancellation of units (in units)					(191,000)
Common Units, Outstanding (in units)	355,017,000		331,975,000		355,017,000	331,975,000	329,661,000
Unitholders’ Capital
Balance Beginning		$ 5,395,811		$ 6,291,824	$ 5,395,811	$ 6,291,824	$ 4,136,240
Sale of units, net of offering costs of $8,762					224,665
Issuance of units					0	13,354	2,783,907
Cancellation of units					(672)
Purchase of units					0
Distributions to unitholders					(323,878)	(962,048)	(682,241)
Unit-based compensation expenses					56,136	53,284	42,703
Reclassification of distributions paid on forfeited restricted units					865	602	176
Excess tax benefit from unit-based compensation and other						347	160
Excess tax benefit from unit-based compensation and other					(9,811)
Deferred tax on capital contribution						(1,552)	(10,879)
Net loss					0	0	0
Balance Ending	$ 5,343,116		$ 5,395,811		5,343,116	5,395,811	6,291,824
Accumulated Income (Deficit)
Balance Beginning		(852,206)		(400,397)	(852,206)	(400,397)	290,940
Sale of units, net of offering costs of $8,762					0
Issuance of units					0	0	0
Cancellation of units					0
Purchase of units					0
Distributions to unitholders					0	0	0
Unit-based compensation expenses					0	0	0
Reclassification of distributions paid on forfeited restricted units					0	0	0
Excess tax benefit from unit-based compensation and other						0	0
Excess tax benefit from unit-based compensation and other					0
Deferred tax on capital contribution						0	0
Net loss					(4,759,811)	(451,809)	(691,337)
Balance Ending	(5,612,017)		(852,206)		(5,612,017)	(852,206)	(400,397)
Treasury Units (at Cost)
Balance Beginning		$ 0		$ 0	0	0	0
Sale of units, net of offering costs of $8,762					0
Issuance of units					0	0	0
Cancellation of units					672
Purchase of units					(672)
Distributions to unitholders					0	0	0
Unit-based compensation expenses					0	0	0
Reclassification of distributions paid on forfeited restricted units					0	0	0
Excess tax benefit from unit-based compensation and other						0	0
Excess tax benefit from unit-based compensation and other					0
Deferred tax on capital contribution						0	0
Net loss					0	0	0
Balance Ending	$ 0		$ 0		$ 0	$ 0	$ 0